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php5  5.3.10
Functions
expr.c File Reference
#include "sqliteInt.h"
#include <ctype.h>

Go to the source code of this file.

Functions

ExprsqliteExpr (int op, Expr *pLeft, Expr *pRight, Token *pToken)
void sqliteExprSpan (Expr *pExpr, Token *pLeft, Token *pRight)
ExprsqliteExprFunction (ExprList *pList, Token *pToken)
void sqliteExprDelete (Expr *p)
ExprsqliteExprDup (Expr *p)
void sqliteTokenCopy (Token *pTo, Token *pFrom)
ExprListsqliteExprListDup (ExprList *p)
SrcListsqliteSrcListDup (SrcList *p)
IdListsqliteIdListDup (IdList *p)
SelectsqliteSelectDup (Select *p)
ExprListsqliteExprListAppend (ExprList *pList, Expr *pExpr, Token *pName)
void sqliteExprListDelete (ExprList *pList)
int sqliteExprIsConstant (Expr *p)
int sqliteExprIsInteger (Expr *p, int *pValue)
int sqliteIsRowid (const char *z)
static int lookupName (Parse *pParse, Token *pDbToken, Token *pTableToken, Token *pColumnToken, SrcList *pSrcList, ExprList *pEList, Expr *pExpr)
int sqliteExprResolveIds (Parse *pParse, SrcList *pSrcList, ExprList *pEList, Expr *pExpr)
static void getFunctionName (Expr *pExpr, const char **pzName, int *pnName)
int sqliteExprCheck (Parse *pParse, Expr *pExpr, int allowAgg, int *pIsAgg)
int sqliteExprType (Expr *p)
void sqliteExprCode (Parse *pParse, Expr *pExpr)
int sqliteExprCodeExprList (Parse *pParse, ExprList *pList, int includeTypes)
void sqliteExprIfTrue (Parse *pParse, Expr *pExpr, int dest, int jumpIfNull)
void sqliteExprIfFalse (Parse *pParse, Expr *pExpr, int dest, int jumpIfNull)
int sqliteExprCompare (Expr *pA, Expr *pB)
static int appendAggInfo (Parse *pParse)
int sqliteExprAnalyzeAggregates (Parse *pParse, Expr *pExpr)
FuncDefsqliteFindFunction (sqlite *db, const char *zName, int nName, int nArg, int createFlag)

Function Documentation

static int appendAggInfo ( Parse pParse) [static]

Definition at line 1526 of file expr.c.

                                       {
  if( (pParse->nAgg & 0x7)==0 ){
    int amt = pParse->nAgg + 8;
    AggExpr *aAgg = sqliteRealloc(pParse->aAgg, amt*sizeof(pParse->aAgg[0]));
    if( aAgg==0 ){
      return -1;
    }
    pParse->aAgg = aAgg;
  }
  memset(&pParse->aAgg[pParse->nAgg], 0, sizeof(pParse->aAgg[0]));
  return pParse->nAgg++;
}

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static void getFunctionName ( Expr pExpr,
const char **  pzName,
int pnName 
) [static]

Definition at line 789 of file expr.c.

                                                                          {
  switch( pExpr->op ){
    case TK_FUNCTION: {
      *pzName = pExpr->token.z;
      *pnName = pExpr->token.n;
      break;
    }
    case TK_LIKE: {
      *pzName = "like";
      *pnName = 4;
      break;
    }
    case TK_GLOB: {
      *pzName = "glob";
      *pnName = 4;
      break;
    }
    default: {
      *pzName = "can't happen";
      *pnName = 12;
      break;
    }
  }
}

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static int lookupName ( Parse pParse,
Token pDbToken,
Token pTableToken,
Token pColumnToken,
SrcList pSrcList,
ExprList pEList,
Expr pExpr 
) [static]

Definition at line 409 of file expr.c.

 {
  char *zDb = 0;       /* Name of the database.  The "X" in X.Y.Z */
  char *zTab = 0;      /* Name of the table.  The "Y" in X.Y.Z or Y.Z */
  char *zCol = 0;      /* Name of the column.  The "Z" */
  int i, j;            /* Loop counters */
  int cnt = 0;         /* Number of matching column names */
  int cntTab = 0;      /* Number of matching table names */
  sqlite *db = pParse->db;  /* The database */

  assert( pColumnToken && pColumnToken->z ); /* The Z in X.Y.Z cannot be NULL */
  if( pDbToken && pDbToken->z ){
    zDb = sqliteStrNDup(pDbToken->z, pDbToken->n);
    sqliteDequote(zDb);
  }else{
    zDb = 0;
  }
  if( pTableToken && pTableToken->z ){
    zTab = sqliteStrNDup(pTableToken->z, pTableToken->n);
    sqliteDequote(zTab);
  }else{
    assert( zDb==0 );
    zTab = 0;
  }
  zCol = sqliteStrNDup(pColumnToken->z, pColumnToken->n);
  sqliteDequote(zCol);
  if( sqlite_malloc_failed ){
    return 1;  /* Leak memory (zDb and zTab) if malloc fails */
  }
  assert( zTab==0 || pEList==0 );

  pExpr->iTable = -1;
  for(i=0; i<pSrcList->nSrc; i++){
    struct SrcList_item *pItem = &pSrcList->a[i];
    Table *pTab = pItem->pTab;
    Column *pCol;

    if( pTab==0 ) continue;
    assert( pTab->nCol>0 );
    if( zTab ){
      if( pItem->zAlias ){
        char *zTabName = pItem->zAlias;
        if( sqliteStrICmp(zTabName, zTab)!=0 ) continue;
      }else{
        char *zTabName = pTab->zName;
        if( zTabName==0 || sqliteStrICmp(zTabName, zTab)!=0 ) continue;
        if( zDb!=0 && sqliteStrICmp(db->aDb[pTab->iDb].zName, zDb)!=0 ){
          continue;
        }
      }
    }
    if( 0==(cntTab++) ){
      pExpr->iTable = pItem->iCursor;
      pExpr->iDb = pTab->iDb;
    }
    for(j=0, pCol=pTab->aCol; j<pTab->nCol; j++, pCol++){
      if( sqliteStrICmp(pCol->zName, zCol)==0 ){
        cnt++;
        pExpr->iTable = pItem->iCursor;
        pExpr->iDb = pTab->iDb;
        /* Substitute the rowid (column -1) for the INTEGER PRIMARY KEY */
        pExpr->iColumn = j==pTab->iPKey ? -1 : j;
        pExpr->dataType = pCol->sortOrder & SQLITE_SO_TYPEMASK;
        break;
      }
    }
  }

  /* If we have not already resolved the name, then maybe 
  ** it is a new.* or old.* trigger argument reference
  */
  if( zDb==0 && zTab!=0 && cnt==0 && pParse->trigStack!=0 ){
    TriggerStack *pTriggerStack = pParse->trigStack;
    Table *pTab = 0;
    if( pTriggerStack->newIdx != -1 && sqliteStrICmp("new", zTab) == 0 ){
      pExpr->iTable = pTriggerStack->newIdx;
      assert( pTriggerStack->pTab );
      pTab = pTriggerStack->pTab;
    }else if( pTriggerStack->oldIdx != -1 && sqliteStrICmp("old", zTab) == 0 ){
      pExpr->iTable = pTriggerStack->oldIdx;
      assert( pTriggerStack->pTab );
      pTab = pTriggerStack->pTab;
    }

    if( pTab ){ 
      int j;
      Column *pCol = pTab->aCol;
      
      pExpr->iDb = pTab->iDb;
      cntTab++;
      for(j=0; j < pTab->nCol; j++, pCol++) {
        if( sqliteStrICmp(pCol->zName, zCol)==0 ){
          cnt++;
          pExpr->iColumn = j==pTab->iPKey ? -1 : j;
          pExpr->dataType = pCol->sortOrder & SQLITE_SO_TYPEMASK;
          break;
        }
      }
    }
  }

  /*
  ** Perhaps the name is a reference to the ROWID
  */
  if( cnt==0 && cntTab==1 && sqliteIsRowid(zCol) ){
    cnt = 1;
    pExpr->iColumn = -1;
    pExpr->dataType = SQLITE_SO_NUM;
  }

  /*
  ** If the input is of the form Z (not Y.Z or X.Y.Z) then the name Z
  ** might refer to an result-set alias.  This happens, for example, when
  ** we are resolving names in the WHERE clause of the following command:
  **
  **     SELECT a+b AS x FROM table WHERE x<10;
  **
  ** In cases like this, replace pExpr with a copy of the expression that
  ** forms the result set entry ("a+b" in the example) and return immediately.
  ** Note that the expression in the result set should have already been
  ** resolved by the time the WHERE clause is resolved.
  */
  if( cnt==0 && pEList!=0 ){
    for(j=0; j<pEList->nExpr; j++){
      char *zAs = pEList->a[j].zName;
      if( zAs!=0 && sqliteStrICmp(zAs, zCol)==0 ){
        assert( pExpr->pLeft==0 && pExpr->pRight==0 );
        pExpr->op = TK_AS;
        pExpr->iColumn = j;
        pExpr->pLeft = sqliteExprDup(pEList->a[j].pExpr);
        sqliteFree(zCol);
        assert( zTab==0 && zDb==0 );
        return 0;
      }
    } 
  }

  /*
  ** If X and Y are NULL (in other words if only the column name Z is
  ** supplied) and the value of Z is enclosed in double-quotes, then
  ** Z is a string literal if it doesn't match any column names.  In that
  ** case, we need to return right away and not make any changes to
  ** pExpr.
  */
  if( cnt==0 && zTab==0 && pColumnToken->z[0]=='"' ){
    sqliteFree(zCol);
    return 0;
  }

  /*
  ** cnt==0 means there was not match.  cnt>1 means there were two or
  ** more matches.  Either way, we have an error.
  */
  if( cnt!=1 ){
    char *z = 0;
    char *zErr;
    zErr = cnt==0 ? "no such column: %s" : "ambiguous column name: %s";
    if( zDb ){
      sqliteSetString(&z, zDb, ".", zTab, ".", zCol, 0);
    }else if( zTab ){
      sqliteSetString(&z, zTab, ".", zCol, 0);
    }else{
      z = sqliteStrDup(zCol);
    }
    sqliteErrorMsg(pParse, zErr, z);
    sqliteFree(z);
  }

  /* Clean up and return
  */
  sqliteFree(zDb);
  sqliteFree(zTab);
  sqliteFree(zCol);
  sqliteExprDelete(pExpr->pLeft);
  pExpr->pLeft = 0;
  sqliteExprDelete(pExpr->pRight);
  pExpr->pRight = 0;
  pExpr->op = TK_COLUMN;
  sqliteAuthRead(pParse, pExpr, pSrcList);
  return cnt!=1;
}

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Expr* sqliteExpr ( int  op,
Expr pLeft,
Expr pRight,
Token pToken 
)

Definition at line 25 of file expr.c.

                                                                  {
  Expr *pNew;
  pNew = sqliteMalloc( sizeof(Expr) );
  if( pNew==0 ){
    /* When malloc fails, we leak memory from pLeft and pRight */
    return 0;
  }
  pNew->op = op;
  pNew->pLeft = pLeft;
  pNew->pRight = pRight;
  if( pToken ){
    assert( pToken->dyn==0 );
    pNew->token = *pToken;
    pNew->span = *pToken;
  }else{
    assert( pNew->token.dyn==0 );
    assert( pNew->token.z==0 );
    assert( pNew->token.n==0 );
    if( pLeft && pRight ){
      sqliteExprSpan(pNew, &pLeft->span, &pRight->span);
    }else{
      pNew->span = pNew->token;
    }
  }
  return pNew;
}

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int sqliteExprAnalyzeAggregates ( Parse pParse,
Expr pExpr 
)

Definition at line 1550 of file expr.c.

                                                           {
  int i;
  AggExpr *aAgg;
  int nErr = 0;

  if( pExpr==0 ) return 0;
  switch( pExpr->op ){
    case TK_COLUMN: {
      aAgg = pParse->aAgg;
      for(i=0; i<pParse->nAgg; i++){
        if( aAgg[i].isAgg ) continue;
        if( aAgg[i].pExpr->iTable==pExpr->iTable
         && aAgg[i].pExpr->iColumn==pExpr->iColumn ){
          break;
        }
      }
      if( i>=pParse->nAgg ){
        i = appendAggInfo(pParse);
        if( i<0 ) return 1;
        pParse->aAgg[i].isAgg = 0;
        pParse->aAgg[i].pExpr = pExpr;
      }
      pExpr->iAgg = i;
      break;
    }
    case TK_AGG_FUNCTION: {
      aAgg = pParse->aAgg;
      for(i=0; i<pParse->nAgg; i++){
        if( !aAgg[i].isAgg ) continue;
        if( sqliteExprCompare(aAgg[i].pExpr, pExpr) ){
          break;
        }
      }
      if( i>=pParse->nAgg ){
        i = appendAggInfo(pParse);
        if( i<0 ) return 1;
        pParse->aAgg[i].isAgg = 1;
        pParse->aAgg[i].pExpr = pExpr;
        pParse->aAgg[i].pFunc = sqliteFindFunction(pParse->db,
             pExpr->token.z, pExpr->token.n,
             pExpr->pList ? pExpr->pList->nExpr : 0, 0);
      }
      pExpr->iAgg = i;
      break;
    }
    default: {
      if( pExpr->pLeft ){
        nErr = sqliteExprAnalyzeAggregates(pParse, pExpr->pLeft);
      }
      if( nErr==0 && pExpr->pRight ){
        nErr = sqliteExprAnalyzeAggregates(pParse, pExpr->pRight);
      }
      if( nErr==0 && pExpr->pList ){
        int n = pExpr->pList->nExpr;
        int i;
        for(i=0; nErr==0 && i<n; i++){
          nErr = sqliteExprAnalyzeAggregates(pParse, pExpr->pList->a[i].pExpr);
        }
      }
      break;
    }
  }
  return nErr;
}

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int sqliteExprCheck ( Parse pParse,
Expr pExpr,
int  allowAgg,
int pIsAgg 
)

Definition at line 823 of file expr.c.

                                                                          {
  int nErr = 0;
  if( pExpr==0 ) return 0;
  switch( pExpr->op ){
    case TK_GLOB:
    case TK_LIKE:
    case TK_FUNCTION: {
      int n = pExpr->pList ? pExpr->pList->nExpr : 0;  /* Number of arguments */
      int no_such_func = 0;       /* True if no such function exists */
      int wrong_num_args = 0;     /* True if wrong number of arguments */
      int is_agg = 0;             /* True if is an aggregate function */
      int i;
      int nId;                    /* Number of characters in function name */
      const char *zId;            /* The function name. */
      FuncDef *pDef;

      getFunctionName(pExpr, &zId, &nId);
      pDef = sqliteFindFunction(pParse->db, zId, nId, n, 0);
      if( pDef==0 ){
        pDef = sqliteFindFunction(pParse->db, zId, nId, -1, 0);
        if( pDef==0 ){
          no_such_func = 1;
        }else{
          wrong_num_args = 1;
        }
      }else{
        is_agg = pDef->xFunc==0;
      }
      if( is_agg && !allowAgg ){
        sqliteErrorMsg(pParse, "misuse of aggregate function %.*s()", nId, zId);
        nErr++;
        is_agg = 0;
      }else if( no_such_func ){
        sqliteErrorMsg(pParse, "no such function: %.*s", nId, zId);
        nErr++;
      }else if( wrong_num_args ){
        sqliteErrorMsg(pParse,"wrong number of arguments to function %.*s()",
             nId, zId);
        nErr++;
      }
      if( is_agg ){
        pExpr->op = TK_AGG_FUNCTION;
        if( pIsAgg ) *pIsAgg = 1;
      }
      for(i=0; nErr==0 && i<n; i++){
        nErr = sqliteExprCheck(pParse, pExpr->pList->a[i].pExpr,
                               allowAgg && !is_agg, pIsAgg);
      }
      if( pDef==0 ){
        /* Already reported an error */
      }else if( pDef->dataType>=0 ){
        if( pDef->dataType<n ){
          pExpr->dataType = 
             sqliteExprType(pExpr->pList->a[pDef->dataType].pExpr);
        }else{
          pExpr->dataType = SQLITE_SO_NUM;
        }
      }else if( pDef->dataType==SQLITE_ARGS ){
        pDef->dataType = SQLITE_SO_TEXT;
        for(i=0; i<n; i++){
          if( sqliteExprType(pExpr->pList->a[i].pExpr)==SQLITE_SO_NUM ){
            pExpr->dataType = SQLITE_SO_NUM;
            break;
          }
        }
      }else if( pDef->dataType==SQLITE_NUMERIC ){
        pExpr->dataType = SQLITE_SO_NUM;
      }else{
        pExpr->dataType = SQLITE_SO_TEXT;
      }
    }
    default: {
      if( pExpr->pLeft ){
        nErr = sqliteExprCheck(pParse, pExpr->pLeft, allowAgg, pIsAgg);
      }
      if( nErr==0 && pExpr->pRight ){
        nErr = sqliteExprCheck(pParse, pExpr->pRight, allowAgg, pIsAgg);
      }
      if( nErr==0 && pExpr->pList ){
        int n = pExpr->pList->nExpr;
        int i;
        for(i=0; nErr==0 && i<n; i++){
          Expr *pE2 = pExpr->pList->a[i].pExpr;
          nErr = sqliteExprCheck(pParse, pE2, allowAgg, pIsAgg);
        }
      }
      break;
    }
  }
  return nErr;
}

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void sqliteExprCode ( Parse pParse,
Expr pExpr 
)

Definition at line 1011 of file expr.c.

                                               {
  Vdbe *v = pParse->pVdbe;
  int op;
  if( v==0 || pExpr==0 ) return;
  switch( pExpr->op ){
    case TK_PLUS:     op = OP_Add;      break;
    case TK_MINUS:    op = OP_Subtract; break;
    case TK_STAR:     op = OP_Multiply; break;
    case TK_SLASH:    op = OP_Divide;   break;
    case TK_AND:      op = OP_And;      break;
    case TK_OR:       op = OP_Or;       break;
    case TK_LT:       op = OP_Lt;       break;
    case TK_LE:       op = OP_Le;       break;
    case TK_GT:       op = OP_Gt;       break;
    case TK_GE:       op = OP_Ge;       break;
    case TK_NE:       op = OP_Ne;       break;
    case TK_EQ:       op = OP_Eq;       break;
    case TK_ISNULL:   op = OP_IsNull;   break;
    case TK_NOTNULL:  op = OP_NotNull;  break;
    case TK_NOT:      op = OP_Not;      break;
    case TK_UMINUS:   op = OP_Negative; break;
    case TK_BITAND:   op = OP_BitAnd;   break;
    case TK_BITOR:    op = OP_BitOr;    break;
    case TK_BITNOT:   op = OP_BitNot;   break;
    case TK_LSHIFT:   op = OP_ShiftLeft;  break;
    case TK_RSHIFT:   op = OP_ShiftRight; break;
    case TK_REM:      op = OP_Remainder;  break;
    default: break;
  }
  switch( pExpr->op ){
    case TK_COLUMN: {
      if( pParse->useAgg ){
        sqliteVdbeAddOp(v, OP_AggGet, 0, pExpr->iAgg);
      }else if( pExpr->iColumn>=0 ){
        sqliteVdbeAddOp(v, OP_Column, pExpr->iTable, pExpr->iColumn);
      }else{
        sqliteVdbeAddOp(v, OP_Recno, pExpr->iTable, 0);
      }
      break;
    }
    case TK_STRING:
    case TK_FLOAT:
    case TK_INTEGER: {
      if( pExpr->op==TK_INTEGER && sqliteFitsIn32Bits(pExpr->token.z) ){
        sqliteVdbeAddOp(v, OP_Integer, atoi(pExpr->token.z), 0);
      }else{
        sqliteVdbeAddOp(v, OP_String, 0, 0);
      }
      assert( pExpr->token.z );
      sqliteVdbeChangeP3(v, -1, pExpr->token.z, pExpr->token.n);
      sqliteVdbeDequoteP3(v, -1);
      break;
    }
    case TK_NULL: {
      sqliteVdbeAddOp(v, OP_String, 0, 0);
      break;
    }
    case TK_VARIABLE: {
      sqliteVdbeAddOp(v, OP_Variable, pExpr->iTable, 0);
      break;
    }
    case TK_LT:
    case TK_LE:
    case TK_GT:
    case TK_GE:
    case TK_NE:
    case TK_EQ: {
      if( pParse->db->file_format>=4 && sqliteExprType(pExpr)==SQLITE_SO_TEXT ){
        op += 6;  /* Convert numeric opcodes to text opcodes */
      }
      /* Fall through into the next case */
    }
    case TK_AND:
    case TK_OR:
    case TK_PLUS:
    case TK_STAR:
    case TK_MINUS:
    case TK_REM:
    case TK_BITAND:
    case TK_BITOR:
    case TK_SLASH: {
      sqliteExprCode(pParse, pExpr->pLeft);
      sqliteExprCode(pParse, pExpr->pRight);
      sqliteVdbeAddOp(v, op, 0, 0);
      break;
    }
    case TK_LSHIFT:
    case TK_RSHIFT: {
      sqliteExprCode(pParse, pExpr->pRight);
      sqliteExprCode(pParse, pExpr->pLeft);
      sqliteVdbeAddOp(v, op, 0, 0);
      break;
    }
    case TK_CONCAT: {
      sqliteExprCode(pParse, pExpr->pLeft);
      sqliteExprCode(pParse, pExpr->pRight);
      sqliteVdbeAddOp(v, OP_Concat, 2, 0);
      break;
    }
    case TK_UMINUS: {
      assert( pExpr->pLeft );
      if( pExpr->pLeft->op==TK_FLOAT || pExpr->pLeft->op==TK_INTEGER ){
        Token *p = &pExpr->pLeft->token;
        char *z = sqliteMalloc( p->n + 2 );
        sprintf(z, "-%.*s", p->n, p->z);
        if( pExpr->pLeft->op==TK_INTEGER && sqliteFitsIn32Bits(z) ){
          sqliteVdbeAddOp(v, OP_Integer, atoi(z), 0);
        }else{
          sqliteVdbeAddOp(v, OP_String, 0, 0);
        }
        sqliteVdbeChangeP3(v, -1, z, p->n+1);
        sqliteFree(z);
        break;
      }
      /* Fall through into TK_NOT */
    }
    case TK_BITNOT:
    case TK_NOT: {
      sqliteExprCode(pParse, pExpr->pLeft);
      sqliteVdbeAddOp(v, op, 0, 0);
      break;
    }
    case TK_ISNULL:
    case TK_NOTNULL: {
      int dest;
      sqliteVdbeAddOp(v, OP_Integer, 1, 0);
      sqliteExprCode(pParse, pExpr->pLeft);
      dest = sqliteVdbeCurrentAddr(v) + 2;
      sqliteVdbeAddOp(v, op, 1, dest);
      sqliteVdbeAddOp(v, OP_AddImm, -1, 0);
      break;
    }
    case TK_AGG_FUNCTION: {
      sqliteVdbeAddOp(v, OP_AggGet, 0, pExpr->iAgg);
      break;
    }
    case TK_GLOB:
    case TK_LIKE:
    case TK_FUNCTION: {
      ExprList *pList = pExpr->pList;
      int nExpr = pList ? pList->nExpr : 0;
      FuncDef *pDef;
      int nId;
      const char *zId;
      getFunctionName(pExpr, &zId, &nId);
      pDef = sqliteFindFunction(pParse->db, zId, nId, nExpr, 0);
      assert( pDef!=0 );
      nExpr = sqliteExprCodeExprList(pParse, pList, pDef->includeTypes);
      sqliteVdbeOp3(v, OP_Function, nExpr, 0, (char*)pDef, P3_POINTER);
      break;
    }
    case TK_SELECT: {
      sqliteVdbeAddOp(v, OP_MemLoad, pExpr->iColumn, 0);
      break;
    }
    case TK_IN: {
      int addr;
      sqliteVdbeAddOp(v, OP_Integer, 1, 0);
      sqliteExprCode(pParse, pExpr->pLeft);
      addr = sqliteVdbeCurrentAddr(v);
      sqliteVdbeAddOp(v, OP_NotNull, -1, addr+4);
      sqliteVdbeAddOp(v, OP_Pop, 2, 0);
      sqliteVdbeAddOp(v, OP_String, 0, 0);
      sqliteVdbeAddOp(v, OP_Goto, 0, addr+6);
      if( pExpr->pSelect ){
        sqliteVdbeAddOp(v, OP_Found, pExpr->iTable, addr+6);
      }else{
        sqliteVdbeAddOp(v, OP_SetFound, pExpr->iTable, addr+6);
      }
      sqliteVdbeAddOp(v, OP_AddImm, -1, 0);
      break;
    }
    case TK_BETWEEN: {
      sqliteExprCode(pParse, pExpr->pLeft);
      sqliteVdbeAddOp(v, OP_Dup, 0, 0);
      sqliteExprCode(pParse, pExpr->pList->a[0].pExpr);
      sqliteVdbeAddOp(v, OP_Ge, 0, 0);
      sqliteVdbeAddOp(v, OP_Pull, 1, 0);
      sqliteExprCode(pParse, pExpr->pList->a[1].pExpr);
      sqliteVdbeAddOp(v, OP_Le, 0, 0);
      sqliteVdbeAddOp(v, OP_And, 0, 0);
      break;
    }
    case TK_UPLUS:
    case TK_AS: {
      sqliteExprCode(pParse, pExpr->pLeft);
      break;
    }
    case TK_CASE: {
      int expr_end_label;
      int jumpInst;
      int addr;
      int nExpr;
      int i;

      assert(pExpr->pList);
      assert((pExpr->pList->nExpr % 2) == 0);
      assert(pExpr->pList->nExpr > 0);
      nExpr = pExpr->pList->nExpr;
      expr_end_label = sqliteVdbeMakeLabel(v);
      if( pExpr->pLeft ){
        sqliteExprCode(pParse, pExpr->pLeft);
      }
      for(i=0; i<nExpr; i=i+2){
        sqliteExprCode(pParse, pExpr->pList->a[i].pExpr);
        if( pExpr->pLeft ){
          sqliteVdbeAddOp(v, OP_Dup, 1, 1);
          jumpInst = sqliteVdbeAddOp(v, OP_Ne, 1, 0);
          sqliteVdbeAddOp(v, OP_Pop, 1, 0);
        }else{
          jumpInst = sqliteVdbeAddOp(v, OP_IfNot, 1, 0);
        }
        sqliteExprCode(pParse, pExpr->pList->a[i+1].pExpr);
        sqliteVdbeAddOp(v, OP_Goto, 0, expr_end_label);
        addr = sqliteVdbeCurrentAddr(v);
        sqliteVdbeChangeP2(v, jumpInst, addr);
      }
      if( pExpr->pLeft ){
        sqliteVdbeAddOp(v, OP_Pop, 1, 0);
      }
      if( pExpr->pRight ){
        sqliteExprCode(pParse, pExpr->pRight);
      }else{
        sqliteVdbeAddOp(v, OP_String, 0, 0);
      }
      sqliteVdbeResolveLabel(v, expr_end_label);
      break;
    }
    case TK_RAISE: {
      if( !pParse->trigStack ){
        sqliteErrorMsg(pParse,
                       "RAISE() may only be used within a trigger-program");
        pParse->nErr++;
       return;
      }
      if( pExpr->iColumn == OE_Rollback ||
         pExpr->iColumn == OE_Abort ||
         pExpr->iColumn == OE_Fail ){
         sqliteVdbeOp3(v, OP_Halt, SQLITE_CONSTRAINT, pExpr->iColumn,
                           pExpr->token.z, pExpr->token.n);
         sqliteVdbeDequoteP3(v, -1);
      } else {
         assert( pExpr->iColumn == OE_Ignore );
         sqliteVdbeOp3(v, OP_Goto, 0, pParse->trigStack->ignoreJump,
                           "(IGNORE jump)", 0);
      }
    }
    break;
  }
}

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int sqliteExprCodeExprList ( Parse pParse,
ExprList pList,
int  includeTypes 
)

Definition at line 1270 of file expr.c.

 {
  struct ExprList_item *pItem;
  int i, n;
  Vdbe *v;
  if( pList==0 ) return 0;
  v = sqliteGetVdbe(pParse);
  n = pList->nExpr;
  for(pItem=pList->a, i=0; i<n; i++, pItem++){
    sqliteExprCode(pParse, pItem->pExpr);
    if( includeTypes ){
      sqliteVdbeOp3(v, OP_String, 0, 0, 
         sqliteExprType(pItem->pExpr)==SQLITE_SO_NUM ? "numeric" : "text",
         P3_STATIC);
    }
  }
  return includeTypes ? n*2 : n;
}

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int sqliteExprCompare ( Expr pA,
Expr pB 
)

Definition at line 1492 of file expr.c.

                                         {
  int i;
  if( pA==0 ){
    return pB==0;
  }else if( pB==0 ){
    return 0;
  }
  if( pA->op!=pB->op ) return 0;
  if( !sqliteExprCompare(pA->pLeft, pB->pLeft) ) return 0;
  if( !sqliteExprCompare(pA->pRight, pB->pRight) ) return 0;
  if( pA->pList ){
    if( pB->pList==0 ) return 0;
    if( pA->pList->nExpr!=pB->pList->nExpr ) return 0;
    for(i=0; i<pA->pList->nExpr; i++){
      if( !sqliteExprCompare(pA->pList->a[i].pExpr, pB->pList->a[i].pExpr) ){
        return 0;
      }
    }
  }else if( pB->pList ){
    return 0;
  }
  if( pA->pSelect || pB->pSelect ) return 0;
  if( pA->iTable!=pB->iTable || pA->iColumn!=pB->iColumn ) return 0;
  if( pA->token.z ){
    if( pB->token.z==0 ) return 0;
    if( pB->token.n!=pA->token.n ) return 0;
    if( sqliteStrNICmp(pA->token.z, pB->token.z, pB->token.n)!=0 ) return 0;
  }
  return 1;
}

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void sqliteExprDelete ( Expr p)

Definition at line 96 of file expr.c.

                              {
  if( p==0 ) return;
  if( p->span.dyn ) sqliteFree((char*)p->span.z);
  if( p->token.dyn ) sqliteFree((char*)p->token.z);
  sqliteExprDelete(p->pLeft);
  sqliteExprDelete(p->pRight);
  sqliteExprListDelete(p->pList);
  sqliteSelectDelete(p->pSelect);
  sqliteFree(p);
}

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Expr* sqliteExprDup ( Expr p)

Definition at line 120 of file expr.c.

                            {
  Expr *pNew;
  if( p==0 ) return 0;
  pNew = sqliteMallocRaw( sizeof(*p) );
  if( pNew==0 ) return 0;
  memcpy(pNew, p, sizeof(*pNew));
  if( p->token.z!=0 ){
    pNew->token.z = sqliteStrNDup(p->token.z, p->token.n);
    pNew->token.dyn = 1;
  }else{
    assert( pNew->token.z==0 );
  }
  pNew->span.z = 0;
  pNew->pLeft = sqliteExprDup(p->pLeft);
  pNew->pRight = sqliteExprDup(p->pRight);
  pNew->pList = sqliteExprListDup(p->pList);
  pNew->pSelect = sqliteSelectDup(p->pSelect);
  return pNew;
}

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Expr* sqliteExprFunction ( ExprList pList,
Token pToken 
)

Definition at line 74 of file expr.c.

                                                        {
  Expr *pNew;
  pNew = sqliteMalloc( sizeof(Expr) );
  if( pNew==0 ){
    /* sqliteExprListDelete(pList); // Leak pList when malloc fails */
    return 0;
  }
  pNew->op = TK_FUNCTION;
  pNew->pList = pList;
  if( pToken ){
    assert( pToken->dyn==0 );
    pNew->token = *pToken;
  }else{
    pNew->token.z = 0;
  }
  pNew->span = pNew->token;
  return pNew;
}

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void sqliteExprIfFalse ( Parse pParse,
Expr pExpr,
int  dest,
int  jumpIfNull 
)

Definition at line 1395 of file expr.c.

                                                                            {
  Vdbe *v = pParse->pVdbe;
  int op = 0;
  if( v==0 || pExpr==0 ) return;
  switch( pExpr->op ){
    case TK_LT:       op = OP_Ge;       break;
    case TK_LE:       op = OP_Gt;       break;
    case TK_GT:       op = OP_Le;       break;
    case TK_GE:       op = OP_Lt;       break;
    case TK_NE:       op = OP_Eq;       break;
    case TK_EQ:       op = OP_Ne;       break;
    case TK_ISNULL:   op = OP_NotNull;  break;
    case TK_NOTNULL:  op = OP_IsNull;   break;
    default:  break;
  }
  switch( pExpr->op ){
    case TK_AND: {
      sqliteExprIfFalse(pParse, pExpr->pLeft, dest, jumpIfNull);
      sqliteExprIfFalse(pParse, pExpr->pRight, dest, jumpIfNull);
      break;
    }
    case TK_OR: {
      int d2 = sqliteVdbeMakeLabel(v);
      sqliteExprIfTrue(pParse, pExpr->pLeft, d2, !jumpIfNull);
      sqliteExprIfFalse(pParse, pExpr->pRight, dest, jumpIfNull);
      sqliteVdbeResolveLabel(v, d2);
      break;
    }
    case TK_NOT: {
      sqliteExprIfTrue(pParse, pExpr->pLeft, dest, jumpIfNull);
      break;
    }
    case TK_LT:
    case TK_LE:
    case TK_GT:
    case TK_GE:
    case TK_NE:
    case TK_EQ: {
      if( pParse->db->file_format>=4 && sqliteExprType(pExpr)==SQLITE_SO_TEXT ){
        /* Convert numeric comparison opcodes into text comparison opcodes.
        ** This step depends on the fact that the text comparision opcodes are
        ** always 6 greater than their corresponding numeric comparison
        ** opcodes.
        */
        assert( OP_Eq+6 == OP_StrEq );
        op += 6;
      }
      sqliteExprCode(pParse, pExpr->pLeft);
      sqliteExprCode(pParse, pExpr->pRight);
      sqliteVdbeAddOp(v, op, jumpIfNull, dest);
      break;
    }
    case TK_ISNULL:
    case TK_NOTNULL: {
      sqliteExprCode(pParse, pExpr->pLeft);
      sqliteVdbeAddOp(v, op, 1, dest);
      break;
    }
    case TK_IN: {
      int addr;
      sqliteExprCode(pParse, pExpr->pLeft);
      addr = sqliteVdbeCurrentAddr(v);
      sqliteVdbeAddOp(v, OP_NotNull, -1, addr+3);
      sqliteVdbeAddOp(v, OP_Pop, 1, 0);
      sqliteVdbeAddOp(v, OP_Goto, 0, jumpIfNull ? dest : addr+4);
      if( pExpr->pSelect ){
        sqliteVdbeAddOp(v, OP_NotFound, pExpr->iTable, dest);
      }else{
        sqliteVdbeAddOp(v, OP_SetNotFound, pExpr->iTable, dest);
      }
      break;
    }
    case TK_BETWEEN: {
      int addr;
      sqliteExprCode(pParse, pExpr->pLeft);
      sqliteVdbeAddOp(v, OP_Dup, 0, 0);
      sqliteExprCode(pParse, pExpr->pList->a[0].pExpr);
      addr = sqliteVdbeCurrentAddr(v);
      sqliteVdbeAddOp(v, OP_Ge, !jumpIfNull, addr+3);
      sqliteVdbeAddOp(v, OP_Pop, 1, 0);
      sqliteVdbeAddOp(v, OP_Goto, 0, dest);
      sqliteExprCode(pParse, pExpr->pList->a[1].pExpr);
      sqliteVdbeAddOp(v, OP_Gt, jumpIfNull, dest);
      break;
    }
    default: {
      sqliteExprCode(pParse, pExpr);
      sqliteVdbeAddOp(v, OP_IfNot, jumpIfNull, dest);
      break;
    }
  }
}

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void sqliteExprIfTrue ( Parse pParse,
Expr pExpr,
int  dest,
int  jumpIfNull 
)

Definition at line 1300 of file expr.c.

                                                                           {
  Vdbe *v = pParse->pVdbe;
  int op = 0;
  if( v==0 || pExpr==0 ) return;
  switch( pExpr->op ){
    case TK_LT:       op = OP_Lt;       break;
    case TK_LE:       op = OP_Le;       break;
    case TK_GT:       op = OP_Gt;       break;
    case TK_GE:       op = OP_Ge;       break;
    case TK_NE:       op = OP_Ne;       break;
    case TK_EQ:       op = OP_Eq;       break;
    case TK_ISNULL:   op = OP_IsNull;   break;
    case TK_NOTNULL:  op = OP_NotNull;  break;
    default:  break;
  }
  switch( pExpr->op ){
    case TK_AND: {
      int d2 = sqliteVdbeMakeLabel(v);
      sqliteExprIfFalse(pParse, pExpr->pLeft, d2, !jumpIfNull);
      sqliteExprIfTrue(pParse, pExpr->pRight, dest, jumpIfNull);
      sqliteVdbeResolveLabel(v, d2);
      break;
    }
    case TK_OR: {
      sqliteExprIfTrue(pParse, pExpr->pLeft, dest, jumpIfNull);
      sqliteExprIfTrue(pParse, pExpr->pRight, dest, jumpIfNull);
      break;
    }
    case TK_NOT: {
      sqliteExprIfFalse(pParse, pExpr->pLeft, dest, jumpIfNull);
      break;
    }
    case TK_LT:
    case TK_LE:
    case TK_GT:
    case TK_GE:
    case TK_NE:
    case TK_EQ: {
      sqliteExprCode(pParse, pExpr->pLeft);
      sqliteExprCode(pParse, pExpr->pRight);
      if( pParse->db->file_format>=4 && sqliteExprType(pExpr)==SQLITE_SO_TEXT ){
        op += 6;  /* Convert numeric opcodes to text opcodes */
      }
      sqliteVdbeAddOp(v, op, jumpIfNull, dest);
      break;
    }
    case TK_ISNULL:
    case TK_NOTNULL: {
      sqliteExprCode(pParse, pExpr->pLeft);
      sqliteVdbeAddOp(v, op, 1, dest);
      break;
    }
    case TK_IN: {
      int addr;
      sqliteExprCode(pParse, pExpr->pLeft);
      addr = sqliteVdbeCurrentAddr(v);
      sqliteVdbeAddOp(v, OP_NotNull, -1, addr+3);
      sqliteVdbeAddOp(v, OP_Pop, 1, 0);
      sqliteVdbeAddOp(v, OP_Goto, 0, jumpIfNull ? dest : addr+4);
      if( pExpr->pSelect ){
        sqliteVdbeAddOp(v, OP_Found, pExpr->iTable, dest);
      }else{
        sqliteVdbeAddOp(v, OP_SetFound, pExpr->iTable, dest);
      }
      break;
    }
    case TK_BETWEEN: {
      int addr;
      sqliteExprCode(pParse, pExpr->pLeft);
      sqliteVdbeAddOp(v, OP_Dup, 0, 0);
      sqliteExprCode(pParse, pExpr->pList->a[0].pExpr);
      addr = sqliteVdbeAddOp(v, OP_Lt, !jumpIfNull, 0);
      sqliteExprCode(pParse, pExpr->pList->a[1].pExpr);
      sqliteVdbeAddOp(v, OP_Le, jumpIfNull, dest);
      sqliteVdbeAddOp(v, OP_Integer, 0, 0);
      sqliteVdbeChangeP2(v, addr, sqliteVdbeCurrentAddr(v));
      sqliteVdbeAddOp(v, OP_Pop, 1, 0);
      break;
    }
    default: {
      sqliteExprCode(pParse, pExpr);
      sqliteVdbeAddOp(v, OP_If, jumpIfNull, dest);
      break;
    }
  }
}

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Definition at line 303 of file expr.c.

                                 {
  switch( p->op ){
    case TK_ID:
    case TK_COLUMN:
    case TK_DOT:
    case TK_FUNCTION:
      return 0;
    case TK_NULL:
    case TK_STRING:
    case TK_INTEGER:
    case TK_FLOAT:
    case TK_VARIABLE:
      return 1;
    default: {
      if( p->pLeft && !sqliteExprIsConstant(p->pLeft) ) return 0;
      if( p->pRight && !sqliteExprIsConstant(p->pRight) ) return 0;
      if( p->pList ){
        int i;
        for(i=0; i<p->pList->nExpr; i++){
          if( !sqliteExprIsConstant(p->pList->a[i].pExpr) ) return 0;
        }
      }
      return p->pLeft!=0 || p->pRight!=0 || (p->pList && p->pList->nExpr>0);
    }
  }
  return 0;
}

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int sqliteExprIsInteger ( Expr p,
int pValue 
)

Definition at line 337 of file expr.c.

                                             {
  switch( p->op ){
    case TK_INTEGER: {
      if( sqliteFitsIn32Bits(p->token.z) ){
        *pValue = atoi(p->token.z);
        return 1;
      }
      break;
    }
    case TK_STRING: {
      const char *z = p->token.z;
      int n = p->token.n;
      if( n>0 && z[0]=='-' ){ z++; n--; }
      while( n>0 && *z && isdigit(*z) ){ z++; n--; }
      if( n==0 && sqliteFitsIn32Bits(p->token.z) ){
        *pValue = atoi(p->token.z);
        return 1;
      }
      break;
    }
    case TK_UPLUS: {
      return sqliteExprIsInteger(p->pLeft, pValue);
    }
    case TK_UMINUS: {
      int v;
      if( sqliteExprIsInteger(p->pLeft, &v) ){
        *pValue = -v;
        return 1;
      }
      break;
    }
    default: break;
  }
  return 0;
}

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ExprList* sqliteExprListAppend ( ExprList pList,
Expr pExpr,
Token pName 
)

Definition at line 248 of file expr.c.

                                                                          {
  if( pList==0 ){
    pList = sqliteMalloc( sizeof(ExprList) );
    if( pList==0 ){
      /* sqliteExprDelete(pExpr); // Leak memory if malloc fails */
      return 0;
    }
    assert( pList->nAlloc==0 );
  }
  if( pList->nAlloc<=pList->nExpr ){
    pList->nAlloc = pList->nAlloc*2 + 4;
    pList->a = sqliteRealloc(pList->a, pList->nAlloc*sizeof(pList->a[0]));
    if( pList->a==0 ){
      /* sqliteExprDelete(pExpr); // Leak memory if malloc fails */
      pList->nExpr = pList->nAlloc = 0;
      return pList;
    }
  }
  assert( pList->a!=0 );
  if( pExpr || pName ){
    struct ExprList_item *pItem = &pList->a[pList->nExpr++];
    memset(pItem, 0, sizeof(*pItem));
    pItem->pExpr = pExpr;
    if( pName ){
      sqliteSetNString(&pItem->zName, pName->z, pName->n, 0);
      sqliteDequote(pItem->zName);
    }
  }
  return pList;
}

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void sqliteExprListDelete ( ExprList pList)

Definition at line 282 of file expr.c.

                                          {
  int i;
  if( pList==0 ) return;
  assert( pList->a!=0 || (pList->nExpr==0 && pList->nAlloc==0) );
  assert( pList->nExpr<=pList->nAlloc );
  for(i=0; i<pList->nExpr; i++){
    sqliteExprDelete(pList->a[i].pExpr);
    sqliteFree(pList->a[i].zName);
  }
  sqliteFree(pList->a);
  sqliteFree(pList);
}

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Definition at line 149 of file expr.c.

                                        {
  ExprList *pNew;
  struct ExprList_item *pItem;
  int i;
  if( p==0 ) return 0;
  pNew = sqliteMalloc( sizeof(*pNew) );
  if( pNew==0 ) return 0;
  pNew->nExpr = pNew->nAlloc = p->nExpr;
  pNew->a = pItem = sqliteMalloc( p->nExpr*sizeof(p->a[0]) );
  if( pItem==0 ){
    sqliteFree(pNew);
    return 0;
  }
  for(i=0; i<p->nExpr; i++, pItem++){
    Expr *pNewExpr, *pOldExpr;
    pItem->pExpr = pNewExpr = sqliteExprDup(pOldExpr = p->a[i].pExpr);
    if( pOldExpr->span.z!=0 && pNewExpr ){
      /* Always make a copy of the span for top-level expressions in the
      ** expression list.  The logic in SELECT processing that determines
      ** the names of columns in the result set needs this information */
      sqliteTokenCopy(&pNewExpr->span, &pOldExpr->span);
    }
    assert( pNewExpr==0 || pNewExpr->span.z!=0 
            || pOldExpr->span.z==0 || sqlite_malloc_failed );
    pItem->zName = sqliteStrDup(p->a[i].zName);
    pItem->sortOrder = p->a[i].sortOrder;
    pItem->isAgg = p->a[i].isAgg;
    pItem->done = 0;
  }
  return pNew;
}

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int sqliteExprResolveIds ( Parse pParse,
SrcList pSrcList,
ExprList pEList,
Expr pExpr 
)

Definition at line 629 of file expr.c.

 {
  int i;

  if( pExpr==0 || pSrcList==0 ) return 0;
  for(i=0; i<pSrcList->nSrc; i++){
    assert( pSrcList->a[i].iCursor>=0 && pSrcList->a[i].iCursor<pParse->nTab );
  }
  switch( pExpr->op ){
    /* Double-quoted strings (ex: "abc") are used as identifiers if
    ** possible.  Otherwise they remain as strings.  Single-quoted
    ** strings (ex: 'abc') are always string literals.
    */
    case TK_STRING: {
      if( pExpr->token.z[0]=='\'' ) break;
      /* Fall thru into the TK_ID case if this is a double-quoted string */
    }
    /* A lone identifier is the name of a columnd.
    */
    case TK_ID: {
      if( lookupName(pParse, 0, 0, &pExpr->token, pSrcList, pEList, pExpr) ){
        return 1;
      }
      break; 
    }
  
    /* A table name and column name:     ID.ID
    ** Or a database, table and column:  ID.ID.ID
    */
    case TK_DOT: {
      Token *pColumn;
      Token *pTable;
      Token *pDb;
      Expr *pRight;

      pRight = pExpr->pRight;
      if( pRight->op==TK_ID ){
        pDb = 0;
        pTable = &pExpr->pLeft->token;
        pColumn = &pRight->token;
      }else{
        assert( pRight->op==TK_DOT );
        pDb = &pExpr->pLeft->token;
        pTable = &pRight->pLeft->token;
        pColumn = &pRight->pRight->token;
      }
      if( lookupName(pParse, pDb, pTable, pColumn, pSrcList, 0, pExpr) ){
        return 1;
      }
      break;
    }

    case TK_IN: {
      Vdbe *v = sqliteGetVdbe(pParse);
      if( v==0 ) return 1;
      if( sqliteExprResolveIds(pParse, pSrcList, pEList, pExpr->pLeft) ){
        return 1;
      }
      if( pExpr->pSelect ){
        /* Case 1:     expr IN (SELECT ...)
        **
        ** Generate code to write the results of the select into a temporary
        ** table.  The cursor number of the temporary table has already
        ** been put in iTable by sqliteExprResolveInSelect().
        */
        pExpr->iTable = pParse->nTab++;
        sqliteVdbeAddOp(v, OP_OpenTemp, pExpr->iTable, 1);
        sqliteSelect(pParse, pExpr->pSelect, SRT_Set, pExpr->iTable, 0,0,0);
      }else if( pExpr->pList ){
        /* Case 2:     expr IN (exprlist)
        **
        ** Create a set to put the exprlist values in.  The Set id is stored
        ** in iTable.
        */
        int i, iSet;
        for(i=0; i<pExpr->pList->nExpr; i++){
          Expr *pE2 = pExpr->pList->a[i].pExpr;
          if( !sqliteExprIsConstant(pE2) ){
            sqliteErrorMsg(pParse,
              "right-hand side of IN operator must be constant");
            return 1;
          }
          if( sqliteExprCheck(pParse, pE2, 0, 0) ){
            return 1;
          }
        }
        iSet = pExpr->iTable = pParse->nSet++;
        for(i=0; i<pExpr->pList->nExpr; i++){
          Expr *pE2 = pExpr->pList->a[i].pExpr;
          switch( pE2->op ){
            case TK_FLOAT:
            case TK_INTEGER:
            case TK_STRING: {
              int addr;
              assert( pE2->token.z );
              addr = sqliteVdbeOp3(v, OP_SetInsert, iSet, 0,
                                  pE2->token.z, pE2->token.n);
              sqliteVdbeDequoteP3(v, addr);
              break;
            }
            default: {
              sqliteExprCode(pParse, pE2);
              sqliteVdbeAddOp(v, OP_SetInsert, iSet, 0);
              break;
            }
          }
        }
      }
      break;
    }

    case TK_SELECT: {
      /* This has to be a scalar SELECT.  Generate code to put the
      ** value of this select in a memory cell and record the number
      ** of the memory cell in iColumn.
      */
      pExpr->iColumn = pParse->nMem++;
      if( sqliteSelect(pParse, pExpr->pSelect, SRT_Mem, pExpr->iColumn,0,0,0) ){
        return 1;
      }
      break;
    }

    /* For all else, just recursively walk the tree */
    default: {
      if( pExpr->pLeft
      && sqliteExprResolveIds(pParse, pSrcList, pEList, pExpr->pLeft) ){
        return 1;
      }
      if( pExpr->pRight 
      && sqliteExprResolveIds(pParse, pSrcList, pEList, pExpr->pRight) ){
        return 1;
      }
      if( pExpr->pList ){
        int i;
        ExprList *pList = pExpr->pList;
        for(i=0; i<pList->nExpr; i++){
          Expr *pArg = pList->a[i].pExpr;
          if( sqliteExprResolveIds(pParse, pSrcList, pEList, pArg) ){
            return 1;
          }
        }
      }
    }
  }
  return 0;
}

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void sqliteExprSpan ( Expr pExpr,
Token pLeft,
Token pRight 
)

Definition at line 56 of file expr.c.

                                                             {
  assert( pRight!=0 );
  assert( pLeft!=0 );
  /* Note: pExpr might be NULL due to a prior malloc failure */
  if( pExpr && pRight->z && pLeft->z ){
    if( pLeft->dyn==0 && pRight->dyn==0 ){
      pExpr->span.z = pLeft->z;
      pExpr->span.n = pRight->n + Addr(pRight->z) - Addr(pLeft->z);
    }else{
      pExpr->span.z = 0;
    }
  }
}

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Definition at line 922 of file expr.c.

                           {
  if( p==0 ) return SQLITE_SO_NUM;
  while( p ) switch( p->op ){
    case TK_PLUS:
    case TK_MINUS:
    case TK_STAR:
    case TK_SLASH:
    case TK_AND:
    case TK_OR:
    case TK_ISNULL:
    case TK_NOTNULL:
    case TK_NOT:
    case TK_UMINUS:
    case TK_UPLUS:
    case TK_BITAND:
    case TK_BITOR:
    case TK_BITNOT:
    case TK_LSHIFT:
    case TK_RSHIFT:
    case TK_REM:
    case TK_INTEGER:
    case TK_FLOAT:
    case TK_IN:
    case TK_BETWEEN:
    case TK_GLOB:
    case TK_LIKE:
      return SQLITE_SO_NUM;

    case TK_STRING:
    case TK_NULL:
    case TK_CONCAT:
    case TK_VARIABLE:
      return SQLITE_SO_TEXT;

    case TK_LT:
    case TK_LE:
    case TK_GT:
    case TK_GE:
    case TK_NE:
    case TK_EQ:
      if( sqliteExprType(p->pLeft)==SQLITE_SO_NUM ){
        return SQLITE_SO_NUM;
      }
      p = p->pRight;
      break;

    case TK_AS:
      p = p->pLeft;
      break;

    case TK_COLUMN:
    case TK_FUNCTION:
    case TK_AGG_FUNCTION:
      return p->dataType;

    case TK_SELECT:
      assert( p->pSelect );
      assert( p->pSelect->pEList );
      assert( p->pSelect->pEList->nExpr>0 );
      p = p->pSelect->pEList->a[0].pExpr;
      break;

    case TK_CASE: {
      if( p->pRight && sqliteExprType(p->pRight)==SQLITE_SO_NUM ){
        return SQLITE_SO_NUM;
      }
      if( p->pList ){
        int i;
        ExprList *pList = p->pList;
        for(i=1; i<pList->nExpr; i+=2){
          if( sqliteExprType(pList->a[i].pExpr)==SQLITE_SO_NUM ){
            return SQLITE_SO_NUM;
          }
        }
      }
      return SQLITE_SO_TEXT;
    }

    default:
      assert( p->op==TK_ABORT );  /* Can't Happen */
      break;
  }
  return SQLITE_SO_NUM;
}

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FuncDef* sqliteFindFunction ( sqlite db,
const char *  zName,
int  nName,
int  nArg,
int  createFlag 
)

Definition at line 1630 of file expr.c.

 {
  FuncDef *pFirst, *p, *pMaybe;
  pFirst = p = (FuncDef*)sqliteHashFind(&db->aFunc, zName, nName);
  if( p && !createFlag && nArg<0 ){
    while( p && p->xFunc==0 && p->xStep==0 ){ p = p->pNext; }
    return p;
  }
  pMaybe = 0;
  while( p && p->nArg!=nArg ){
    if( p->nArg<0 && !createFlag && (p->xFunc || p->xStep) ) pMaybe = p;
    p = p->pNext;
  }
  if( p && !createFlag && p->xFunc==0 && p->xStep==0 ){
    return 0;
  }
  if( p==0 && pMaybe ){
    assert( createFlag==0 );
    return pMaybe;
  }
  if( p==0 && createFlag && (p = sqliteMalloc(sizeof(*p)))!=0 ){
    p->nArg = nArg;
    p->pNext = pFirst;
    p->dataType = pFirst ? pFirst->dataType : SQLITE_NUMERIC;
    sqliteHashInsert(&db->aFunc, zName, nName, (void*)p);
  }
  return p;
}

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Definition at line 204 of file expr.c.

                                  {
  IdList *pNew;
  int i;
  if( p==0 ) return 0;
  pNew = sqliteMallocRaw( sizeof(*pNew) );
  if( pNew==0 ) return 0;
  pNew->nId = pNew->nAlloc = p->nId;
  pNew->a = sqliteMallocRaw( p->nId*sizeof(p->a[0]) );
  if( pNew->a==0 ) return 0;
  for(i=0; i<p->nId; i++){
    struct IdList_item *pNewItem = &pNew->a[i];
    struct IdList_item *pOldItem = &p->a[i];
    pNewItem->zName = sqliteStrDup(pOldItem->zName);
    pNewItem->idx = pOldItem->idx;
  }
  return pNew;
}

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int sqliteIsRowid ( const char *  z)

Definition at line 376 of file expr.c.

                                {
  if( sqliteStrICmp(z, "_ROWID_")==0 ) return 1;
  if( sqliteStrICmp(z, "ROWID")==0 ) return 1;
  if( sqliteStrICmp(z, "OID")==0 ) return 1;
  return 0;
}

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Definition at line 221 of file expr.c.

                                  {
  Select *pNew;
  if( p==0 ) return 0;
  pNew = sqliteMallocRaw( sizeof(*p) );
  if( pNew==0 ) return 0;
  pNew->isDistinct = p->isDistinct;
  pNew->pEList = sqliteExprListDup(p->pEList);
  pNew->pSrc = sqliteSrcListDup(p->pSrc);
  pNew->pWhere = sqliteExprDup(p->pWhere);
  pNew->pGroupBy = sqliteExprListDup(p->pGroupBy);
  pNew->pHaving = sqliteExprDup(p->pHaving);
  pNew->pOrderBy = sqliteExprListDup(p->pOrderBy);
  pNew->op = p->op;
  pNew->pPrior = sqliteSelectDup(p->pPrior);
  pNew->nLimit = p->nLimit;
  pNew->nOffset = p->nOffset;
  pNew->zSelect = 0;
  pNew->iLimit = -1;
  pNew->iOffset = -1;
  return pNew;
}

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Definition at line 180 of file expr.c.

                                     {
  SrcList *pNew;
  int i;
  int nByte;
  if( p==0 ) return 0;
  nByte = sizeof(*p) + (p->nSrc>0 ? sizeof(p->a[0]) * (p->nSrc-1) : 0);
  pNew = sqliteMallocRaw( nByte );
  if( pNew==0 ) return 0;
  pNew->nSrc = pNew->nAlloc = p->nSrc;
  for(i=0; i<p->nSrc; i++){
    struct SrcList_item *pNewItem = &pNew->a[i];
    struct SrcList_item *pOldItem = &p->a[i];
    pNewItem->zDatabase = sqliteStrDup(pOldItem->zDatabase);
    pNewItem->zName = sqliteStrDup(pOldItem->zName);
    pNewItem->zAlias = sqliteStrDup(pOldItem->zAlias);
    pNewItem->jointype = pOldItem->jointype;
    pNewItem->iCursor = pOldItem->iCursor;
    pNewItem->pTab = 0;
    pNewItem->pSelect = sqliteSelectDup(pOldItem->pSelect);
    pNewItem->pOn = sqliteExprDup(pOldItem->pOn);
    pNewItem->pUsing = sqliteIdListDup(pOldItem->pUsing);
  }
  return pNew;
}

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void sqliteTokenCopy ( Token pTo,
Token pFrom 
)

Definition at line 139 of file expr.c.

                                              {
  if( pTo->dyn ) sqliteFree((char*)pTo->z);
  if( pFrom->z ){
    pTo->n = pFrom->n;
    pTo->z = sqliteStrNDup(pFrom->z, pFrom->n);
    pTo->dyn = 1;
  }else{
    pTo->z = 0;
  }
}

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